linux-kernel - Re: cifs causes BUG: soft lockup detected on CPU

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Message-Id: <20070329022131.e5e48c53.akpm@linux-foundation.org>
Date:	Thu, 29 Mar 2007 02:21:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Valentin Zaharov" <karlos_@...vision.net.il>
Cc:	<linux-kernel@...r.kernel.org>,
	"Steven French" <sfrench@...ibm.com>
Subject: Re: cifs causes BUG: soft lockup detected on CPU

On Thu, 29 Mar 2007 11:13:04 +0200 "Valentin Zaharov" <karlos_@...vision.net.il> wrote:

> I've tried different kernel versions.
> Right now iam using generic 2.6.9-42 on one machine and 2.6.20.1 on
> another one.
> I also tried various distributions ( Suse, CentOS, RHEL4 ) - not sure it
> is relevant.
> Tried installing latest cifs modules, tried changing CIFSMaxBufSize to
> 15000,  without luck.
> Freezes are totally random - sometimes they happen 2-4 times a day,
> sometimes it can take 2 weeks.

Yeah, it's a relatively recently known-bug, I'm afraid.

Probably this will keep you out of trouble until it gets fixed
for real:

--- a/include/linux/fs.h~a
+++ a/include/linux/fs.h
@@ -627,25 +627,7 @@ extern void inode_double_unlock(struct i
  */
 static inline loff_t i_size_read(const struct inode *inode)
 {
-#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
-	loff_t i_size;
-	unsigned int seq;
-
-	do {
-		seq = read_seqcount_begin(&inode->i_size_seqcount);
-		i_size = inode->i_size;
-	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
-	return i_size;
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
-	loff_t i_size;
-
-	preempt_disable();
-	i_size = inode->i_size;
-	preempt_enable();
-	return i_size;
-#else
 	return inode->i_size;
-#endif
 }
 
 /*
_

-
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